quote:Original post by Anonymous Poster
Yes, amazingly, no one here has figured out how to draw circles, and frankly, we're quite upset about it, so no need to rub salt in old wounds!!

This is as far as we've gotten (we are presently working on getting more DARPA funding)
1. Create a vertex buffer, fill it with 2 vertices to draw a line. If you can draw it, have a beer.
2. Add one more vertex to the buffer and draw a line strip. If the strip draws, have another beer.
3. Use the aforementioned equations when adding more points to the vertex buffer. If you can implement the equations, have another beer.

At this point, we usually pass out and wake up with serious headaches (we're lightweights), forcing us to start at #1. Perhaps you can get farther.

quote:Original post by Irrelevant
[kenobi]Use the for, loop...[kenobi]

quote:Original post by Etnu
Circles are round, and directX can only draw in triangles. A circle can never be made from a triangle. The obvious solution is to change the laws of Geometry to accomodate your plan. I would kill for round triangles.

//-----------------------------------------------------------------------------------//Draw a simple circle centered around the given point, using the given//radius and color//-----------------------------------------------------------------------------------void DrawCircle(POINT pt, float radius, D3DCOLOR color, LPDIRECT3DDEVICE8 dev){	const int NUMPOINTS = 24;	D3DTLVERTEX Circle[NUMPOINTS + 1];	int i;	float X;	float Y;	float Theta;	float WedgeAngle;	//Size of angle between two points on the circle (single wedge)	//Precompute WedgeAngle	WedgeAngle = (float)((2*PI) / NUMPOINTS);	//Set up vertices for a circle	//Used <= in the for statement to ensure last point meets first point (closed circle)	for(i=0; i<=NUMPOINTS; i++)	{		//Calculate theta for this vertex		Theta = i * WedgeAngle;				//Compute X and Y locations		X = (float)(pt.x + radius * cos(Theta));		Y = (float)(pt.y - radius * sin(Theta));		Circle[i] = CreateD3DTLVERTEX(X, Y, 0.0f, 1.0f, color, 0.0f, 0.0f);	}	//Now draw the circle	dev->SetVertexShader(D3DFVF_TL);	dev->SetTexture(0, NULL);	dev->DrawPrimitiveUP(D3DPT_LINESTRIP, NUMPOINTS, &Circle[0], sizeof(Circle[0]));}//DrawCircle